@article{oai:kyutech.repo.nii.ac.jp:00001614, author = {Yoshida, T and Shibata, M and Kiuchi, Masaru and 木内, 勝 and 小田部, エドモンド 荘司 and Otabe, Edmund Soji and Matsushita, Teruo and 松下, 照男 and Futamura, M and Konishi, H and Miyata, S and Ibi, A and Yamada, Y and Shiohara, Y}, journal = {Physica C: Superconductivity and its Applications}, month = {Oct}, note = {Significant overestimation of the critical current density Jc is found for the third harmonic voltage measurement method for thin YBCO superconductors. This is caused by a reversible flux motion in pinning potentials, which is known to be significant for superconductors of thickness comparable to or smaller than Campbell’s AC penetration depth. In this paper the effect of reversible flux motion on the estimation of Jc by this method with different thicknesses is also theoretically investigated by using the Campbell model for the force–displacement characteristics of flux lines. Although the factor of overestimation can be approximately explained by the Campbell model, agreement is not satisfactory. It is considered that the variation in the flux motion from reversible to irreversible states seems to take place much faster than assumed in the Campbell model.}, pages = {692--696}, title = {Evaluation of film thickness dependency of the reversible fluxoid motion in the third harmonic voltage method}, volume = {463-465}, year = {2007}, yomi = {キウチ, マサル and オタベ, エドモンド ソウジ and マツシタ, テルオ} }